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8 Energy – forces doing work

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Question 5

Two electric drills are tested while drilling the same material.

DrillTotal energy supplied in JUseful power output in WOperating time in s
P600032012
Q540027010

By what factor must the efficiency of drill Q be multiplied to give the efficiency of drill P?

[1]
A

1.111.111.11

B

1.191.191.19

C

1.281.281.28

D

0.780.780.78

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8 Energy – forces doing work Questions

  1. GCSE
  2. /Physics
  3. /8 Energy – forces doing work

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